JP4620545B2 - Memory management method for display data of light emitting display device - Google Patents

Description

  The present invention relates to a display data memory management method for a light emitting display device, and more particularly to a display data memory management method for an organic light emitting display device using electroluminescence of an organic material.

  In a display region of an active drive type display device such as a liquid crystal display device or an organic electroluminescence display device (hereinafter referred to as an OLED display device), a plurality of selection scanning lines extending in the row direction and a plurality of selection scanning lines extending in the column direction are provided. Data lines are formed. A pixel region is defined by two adjacent selected scanning lines and two adjacent data lines, and pixels are formed in such a pixel region in a matrix form.

  One pixel is formed with an active element, that is, a transistor for transmitting a data signal from the data line in accordance with a selection signal transmitted from the selected scanning line. Therefore, such a display device requires a scan driver for driving the selected scan line and a data driver for driving the data line.

  In such a display device, there are generally many colors depending on the combination of the brightness of an R pixel that emits red (R) light, a G pixel that emits green (G) light, or a B pixel that emits blue (B) light. Expressed. Therefore, generally, R, G, and B pixels are continuously arranged in the row direction in the display device, and separate data lines are connected to each of these R, G, and B pixels.

  In addition, in order to express a large number of colors, such a display device includes a plurality of subpixels each having one color, and the color is expressed by a combination of colors emitted from such subpixels. The In general, one pixel is composed of a sub-pixel that displays red R, a sub-pixel that displays green G, and a sub-pixel that displays blue B, and a color is expressed by a combination of these red, green, and blue.

  Further, since the data driver must convert a digital data signal into an analog signal and apply it to all the data lines, output terminals corresponding to the number of data lines are required.

  However, in general, the data driver is manufactured by a plurality of integrated circuits. However, since the number of output terminals of one integrated circuit is limited, many integrated circuits are used to drive all the data lines. There must be. In addition, when a plurality of transistors, capacitors, and wirings for transmitting a voltage or a signal are formed in one pixel, it is difficult to arrange them inside the pixel. In addition, when the data lines are formed for each of the R, G, and B pixels in the limited display area, and the drive elements for driving such pixels are also formed, the aperture ratio of the pixels is reduced. There is a problem of doing.

  Therefore, the present invention has been made in view of such problems, and the object of the present invention is to classify the data stored in the memory of the light emitting display device into a form suitable for the light emission driving method, thereby improving efficiency. Another object of the present invention is to provide a memory management method for display data of a light emitting display device that can manage the memory in general.

In order to solve the above problems, according to an aspect of the present invention, each of a plurality of pixels includes at least two subpixels that emit light of different colors, and one field includes a first subfield and a second subfield. Are divided into a plurality of subfields, and at least two data signals corresponding to the same color are time-divided between one field and applied to the data lines, and the first subfield and the second subfield are A display data memory management method for a light emitting display device that sequentially applies a selection signal to a plurality of scanning lines;
a) dividing input data corresponding to a display image of the light emitting display device into data of a first subfield or data of a second subfield;
b) arranging the data of the first subfield and the second subfield data in the order of light emission driving;
c) storing the arranged first subfield data and second subfield data separately for each pixel;
A display data memory management method for a light-emitting display device is provided.

  In the conventional light emitting display device, the display data memory was not managed. As described above, the display data is classified and stored in a form that is easy to read from the memory, and the data access time is shortened. , Memory efficiency can be improved.

  Here, the light emission driving in step b) can be time-division driving between adjacent sub-pixels. In addition, the light emission driving in step b) can be time-division driving between the same colors. Since the driving unit formed in one pixel drives the OLED elements of the same color, the white balance of red, green, and blue images can be easily controlled.

  In step c), the arranged first subfield data and second subfield data can be stored in the order read from the memory map. At this time, if 6n input data is provided in the column direction, the memory map may have 3n data in the column direction of each of the first and second subfields.

Furthermore, memory map, k = 0, 1, 2 for each display line, ..., the case of n-1, D S (3k + 1), the data selection signal D S (3k + 2) or D S (3k + 3) Can respond.

  As described above in detail, according to the present invention, the display data of the light emitting display device is classified into an easy-to-read form and stored and managed in the memory, thereby reducing the data access time and improving the efficiency of the memory. it can.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  Hereinafter, a display data memory management method of the light emitting display device according to the present embodiment will be described in detail. FIG. 1 is a schematic plan view of an OLED display device according to the present embodiment. Referring to FIG. 1, the OLED display device includes a display panel 100, a selection scan driver 200, a light emission scan driver 300, and a data driver 400.

Display panel 100 includes a plurality of scan lines Sl to S w extending in the row direction, E1～E w, a plurality of data lines D1~Dm extending in a column direction, a plurality of power lines VDD, and a plurality of pixels 110 Prepare. Pixel 110 is formed in a pixel area defined by two data lines D1~Dm adjacent to the two adjacent scan lines Sl to S w.

Selecting scan driver 200, a data signal connected pixels in the scanning line is sequentially applied to selection signal to a plurality of scan lines Sl to S w so that it can fill, emit scan driver 300, the OLED element sequentially applies the emission signals to the emission scan line E1～E w in order to control the light emission. Each time the selection signal is sequentially applied, the data driver 400 applies a data signal corresponding to the pixel of the scanning line to which the selection signal is applied to the data lines D1 to Dm.

  The selective scanning driver 200, the light emission scanning driver 300, and the data driver 400 are electrically connected to the substrate on which the display panel 400 is formed. In contrast to this, at least one of the selective scanning driving unit 200, the light emission scanning driving unit 300, and the data driving unit 400 can be directly mounted on the glass substrate of the display panel 100. A driver circuit formed in the same layer as the scan line, the data line, and the transistor can be used.

  Alternatively, at least one of the selective scanning driving unit 200, the light emission scanning driving unit 300, and the data driving unit 400 is bonded to the substrate of the display panel 100, and is electrically connected to a TCP (tape carrier package), FPC (flexible printed). It is also possible to mount the circuit in a form such as a chip on a circuit or TAB (tape automatic bonding).

  2A to 2C are diagrams illustrating pixels and sub-pixels of the OLED display device according to the present embodiment, respectively. In the OLED display device, the pixel emission order of the 2: 1 multiplexer (MUX) odd / even field is changed. It is drawing for demonstrating.

  FIG. 2A is a diagram illustrating pixels of an OLED display device, in which R, G, and B pixels are arranged in a column direction and pixels are arranged from a first line in a row direction. When the pixels in the shaded area in FIG. 2A are separated, the odd field subpixels as shown in FIG. 2B are obtained. When only the pixels in the shaded area are arranged, the even field (Even) as shown in FIG. 2C. field) Subpixels can be arranged.

FIG. 3 is an explanatory diagram illustrating driving two sub-pixels according to the present embodiment. As shown in FIG. 2B and FIG. Represents driving a sub-pixel. Here, k = 0, 1, 2, 3 ... when the n-1, the output from the driving integrated circuit D S1, D S2, D S3 , D S4, D S5, D S6 ... D S (3k + 1) , D S (3k + 2) , so that the D S (3k + 3). At this time, the pixels are divided into odd and even numbers, and each has R, G, and B, so that the number of pixels is 6n per line.

(First embodiment)
On the other hand, FIG. 4 is a diagram for schematically explaining light emission driving between adjacent sub-pixels according to the first embodiment. Referring to FIG. 4, light emission driving between adjacent sub-pixels in an OLED display device is divided into an odd field and an even field. In each odd line, R, G, and B OLED elements are arranged as in the upper stage. The light is emitted as indicated by the dotted line portion. Similarly, the R, G, and B OLED elements emit light as indicated by the dotted line portion in the even-numbered lines as in the lower stage portion. Is filled and flashes.

Here, for each data selection signal D S1 and D S2, two adjacent OLED elements are connected, and the light emission order is an odd field and an even field. , It proceeds to the last line to express one frame of video, and normally outputs 60 frames per second.

  On the other hand, FIG. 5 is a diagram schematically showing a pixel of the OLED display device according to the present embodiment. Referring to FIG. 5, each pixel 110 includes two OLED elements that emit light having different colors, and driving units 111 to 113 for driving the OLED elements. Such an OLED element emits light with brightness according to the magnitude of an applied current. Hereinafter, the driving unit and the two OLED elements formed in the pixel region are defined as one pixel.

According to the present embodiment, one field is divided into two subfields and driven, and data of different colors are written in the two subfields to emit light. Therefore, selection scan driver 200 of FIG. 1 is applied to sequentially select the scanning lines Sl to S w a selection signal for each subfield, the emit scan driver 300 also in sub-fields of a single respective colors of the OLED element emitting applies a light emission signal to the emission scan line E1～E w as performed.

  The data driver 400 applies data signals corresponding to OLED elements having different colors to each other in the two subfields to the data lines D1 to Dm. In FIG. 3, the data driver 400 applies data signals corresponding to the red and green OLED elements OLEDr1 and OLEDg1 to the data line D1 in two subfields, respectively, and applies the blue and red OLED elements OLEDb1 and OLEDr2 respectively. A corresponding data signal is applied to the data line D2. Then, data signals respectively corresponding to the green and blue OLED elements OLEDg2 and OLEDb2 are applied to the data line D3.

Hereinafter, a specific operation of the OLED display device according to the present embodiment will be described in detail with reference to FIG. FIG. 6 is a circuit diagram showing a pixel of the OLED display device. 6 shows a pixel coupled to the selection scan line S w and data lines D1 to D3, where the transistor is expressed as p-channel transistors. Since the operations of the three pixels 110a to 110c shown in FIG. 6 are substantially the same, the operation of the pixels will be described with the pixel 110a as the center.

  Hereinafter, the selected scanning line to which the current selection signal is transmitted is referred to as the current scanning line, and the selected scanning line to which the selection signal is transmitted before the current selection signal is transmitted is referred to as the previous scanning line. The pixel 110a includes driving transistors M11, switching transistors M12, M13, and M14, capacitors C11 and C12, OLED elements OLEDr1 and OLEDg1, and light emitting transistors M15a and M15b that control light emission of the OLED elements OLEDr1 and OLEDg1, respectively.

One light-emission scanning line E w is composed of two light-emission signal lines E w a and E w b. Although not shown in FIG. 6, the remaining light-emission scanning lines are also composed of two light-emission signal lines. The light emitting transistors M15a, M15b and light-emitting signal line E w a, E w b is the current from the driving transistor M11 to form a switching unit for selectively transmitting to the OLED element OLEDr1, OLEDg1.

The drive transistor M11 is a drive transistor for driving the OLED element, and is connected between a connection point between a power source for supplying the voltage VDD and the sources of the transistors M15a and M15b. The transistor M11 controls the current flowing through the OLED elements OLEDr and OLEDg through the transistors M15 and M15b by the voltage applied between the gate and the source. The transistor M12 diode-couples the driving transistor M11 in response to the selection signal from the immediately preceding scanning line S w −1.

The electrode A of the capacitor C12 is connected to the gate of the driving transistor M11, and the capacitor C11 and the transistor M13 are connected in parallel between the other electrode B of the capacitor C12 and the power source that supplies the voltage VDD. The transistor M13 supplies the power supply VDD to the other electrode B of the capacitor C12 in response to the selection signal from the immediately preceding scanning line S w −1.

The switching transistor M14 transmits the data voltage from the data line Dm to the capacitor C11 in response to the selection signal from the current scan line S w. Furthermore, light-emitting transistor M15a, M15b are respectively connected between the anode of the drain and the OLED elements OLEDr1, OLEDg1 transistor M11, the emission signal lines E w a, in response to the emission control signal applied from the E w b, of transistor M11 A current is transmitted to the OLED elements OLEDr1 and OLEDg1.

  The OLED elements OLEDr1 and OLEDg1 emit red and green light, respectively, according to the applied current. According to the first embodiment of the present invention, the power supply voltage VSS lower than the voltage VDD is applied to the cathodes of the OLED elements OLEDr1 and OLEDg1. As the power supply voltage VSS, a negative voltage or a ground voltage can be used.

Hereinafter, the operation of the pixel 110a according to the present embodiment will be specifically described. First, when a low-level selection signal is applied to the immediately preceding scanning line S w −1, the switching transistor M12 becomes conductive and the driving transistor M11 enters a diode connection state. Therefore, the voltage between the gate and the source of the driving transistor M11 changes until the threshold voltage VTH of the driving transistor M11 is reached. At this time, since the voltage VDD is applied to the source of the drive transistor M11, the voltage applied to the gate of the drive transistor M11, that is, one electrode A of the capacitor C12 is VDD + VTH. Further, the switching transistor M13 becomes conductive, and the voltage VDD is applied to the other electrode B of the capacitor C12.

Further, since a high-level light emission signal is applied to the light emission signal lines E w a and E w b, the light emission transistors M15a and M15b are cut off, and no current flows through the drive transistor M11 to the OLED elements OLEDr and OLEDg. To be done. Then, since the signal of the high level to the current scan line S w it is applied, the switching transistor M14 is cut off.

Thereafter, when the selection signal of the low level to the current scan line S w is applied, the data voltage VDATA is charged in the capacitor C11 conducting switching transistor M14 is. Since the capacitor C12 is charged with a voltage corresponding to the threshold voltage VTH of the drive transistor M11, a voltage corresponding to the sum of the data voltage VDATA and the threshold voltage VTH of the drive transistor M11 is applied to the gate of the drive transistor M11. Is done.

Furthermore, light-emitting transistor M15a, M15b are respectively light-emitting signal lines E w a, when turned on in response to the emission signal from the E w b, current is emitted is transmitted to the red and green OLED element OLEDr1, OLEDg1. Then, two sub-fields by the selection signal contained in one field is sequentially applied to the selecting scan lines Sl to S w, the two emit signal lines E1a~E w a, are respectively applied to E1b~E w b The two light emission signals have a low level period that is not overlapped between one field.

Similarly to the pixel 110a, the pixels 110b and 110c store the threshold voltages of the drive transistors M21 and M31 in the capacitors C22 and C32 while the selection signal is applied to the immediately preceding scan line S w −1. storing a data voltage VDATA in the capacitors C21, C31 during selection signal S w is applied. Further, switching transistors M22, M23, and M24 and switching transistors M32, M33, and M34 are provided corresponding to the switching transistors M12, M13, and M14 of the pixel 110a.

The light-emitting transistor M25a, M35a are each the conduction is in response to the light emission signal from the emission signal line E w a, the capacitor C21, respectively corresponding current to the voltage stored in C31 blue and green OLED element OLEDb1, OLEDg2 emission is transmitted is performed, light-emitting transistor M25B, when M35b is respectively conducting in response to the light emission signal from the emission signal line E w b, current corresponding to the voltage stored in the capacitor C21, C31 are red and blue The light is transmitted to the OLED elements OLEDr2 and OLEDb2 to emit light.

  FIG. 7 is a diagram showing an input data map of the OLED display device. Referring to FIG. 7, the data input from the data driver 400 of the OLED display device according to the present embodiment has 6n R, G, and B pixels arranged for each line.

  8A and 8B are diagrams for explaining the concept of memory map management of odd (Odd) and even (Even) fields, and memory maps of odd and even fields respectively from the input data map as shown in FIG. It represents dividing into. That is, it is divided into odd field as shown in FIG. 8A and even field data as shown in FIG.

  8A and 8B are divided so that each lower part data indicated by a thick line includes three pieces of R, G, B data. Here, when 6n input data is provided in the column direction, the memory map includes 3n data in the column direction of each of the first and second subfields.

9A and 9B are diagrams showing memory maps of odd and even fields, respectively, according to the present embodiment. In the lower part data of FIGS. 8A and 8B, k = 0, 1, 2,. when -1, the data selection signal D S (3k + 1), D S (3k + 2) and D S (3k + 3) it can be seen that three data are distinguished for each.

Referring to FIG. 9A, in the memory map of the odd field according to the present embodiment, for example, because in the one line is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored in R (1, 1) from R (1,6n-1) to be stored, D S (3k + 2) is turned D S2, emission data is saved from the B (1, 1) to B (1,6n), D S ( 3k + 3) It is taken D S3, the light-emitting data are stored in the range of from G (1, 1) to G (1,6n-1).

Further, since the two lines is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored from the G (2,1) to G (2,6n-1), D S (3k + 2 ) is turned D S2, emission data is saved from R (2, 2) to R (2,6n), D S ( 3k + 3) is turned D S3, the light-emitting data are stored in the B (2, 2) Up to B (2, 6n) is stored. Thereafter, the odd and even lines are stored in the odd field memory map in the manner described above.

Similarly, referring to FIG. 9B, in the memory map of the even field, for example, because in the one line is k = 0, D S (3k + 1) is turned D S1, G emission data from G (1, 1) (1, 6n-1) to be stored, D S (3k + 2) is turned D S2, emission data is saved from R (1, 2) to R (1,6n), D S ( 3k + 3) is D In S3, the emission data is stored from B (1,2) to B (1,6n).

Further, since the two lines is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored from the R (2,1) to R (2,6n-1), D S (3k + 2 ) is turned D S2, emission data is saved from B (2,1) to B (2,6n-1), D S (3k + 3) is turned D S3, the light-emitting data are stored G2 from G2,2 , 6n are stored. Thereafter, the odd and even lines are stored in the even field memory map in the manner described above.

  Accordingly, as shown in FIGS. 9A and 9B, the light emission data between adjacent subpixels is stored separately in each line for each subfield. Further, as described above, since light emitting elements of various colors can be driven by a common driving and switching transistor and capacitor in one pixel, the configuration of the elements used in the pixel and the current, voltage or signal. Can be simplified.

  However, when the pixel according to the first embodiment is actually driven, the voltage stored in the capacitors C12, C22, and C32 is different depending on the voltage state of the drain electrodes of the driving transistors M11, M21, and M31, that is, the node C. Become. That is, when a current flows through the driving transistors M11, M21, and M31, a constant voltage is charged by the drain electrode, that is, the parasitic capacitance of the node C, and the voltage state of the node C is the driving transistor M11, M21 in the previous subfield. , M31 is affected by the current level.

Therefore, when a low-level selection signal is applied to the immediately preceding scanning line S w −1, the voltage VC12 of the one electrode A of the capacitor C12 becomes the same as the voltage of the node C. Therefore, depending on the voltage state of the node C, the capacitor C12 The voltage stored in changes.

Pixels 110a, 100b, 110c, the driving current corresponding to the different colors in two subfields transistors M11, M21, since the flow through the M31, the previous scan line in one subfield after all S w -1 The compensation voltage stored in the capacitors C12, C22, and C32 while the selection signal is applied is influenced by the currents that are supplied from the driving transistors M11, M21, and M31 in the previous subfield.

  Therefore, the capacitors C12, C22, and C32 are charged with the compensation voltage based on the data voltage of the previous subfield, and the data voltages corresponding to different colors are applied to the previous subfield and the current subfield. There was a problem that the deviation of the threshold voltages of M21 and M31 was not accurately compensated.

  In the pixel according to the present embodiment, since the driving transistors drive OLED elements having different colors, it is difficult to control the white balance of red, green, and blue images by adjusting the characteristics of the driving transistors. There was a problem.

(Second Embodiment)
Therefore, in the OLED display device according to the second embodiment, such a problem is solved by driving a OLED element of the same color by a driving unit formed in one pixel. Hereinafter, the pixel of the OLED display device according to the second embodiment will be described in detail with reference to FIGS. FIG. 10 is a diagram for schematically explaining light emission driving between sub-pixels of the same color according to the present embodiment.

Referring to FIG. 10, light emission driving between adjacent sub-pixels is divided into odd and even fields, and the R, G, and B OLED elements are shown as dotted lines in each odd line as in the upper stage. Similarly, in each even line, the R, G, B OLED elements emit light like dotted lines as in the lower part, but in the two subfields, the same color data is entered and emitted. The Here, two identical OLED elements are connected for each of the data selection signals D S1, D S2, and D S3, and the OLED elements in the dotted line portions emit light in the column direction in the odd and even fields, respectively. .

FIG. 11 is a diagram schematically illustrating a pixel of the OLED display device according to the present embodiment. Description To simplify the indicated three pixels 120a to be connected to the data lines D1, D2, D3 and selection scan line S w, 120b, the 120c as a representative. Each of the pixels 120a, 120b, and 120c includes two OLED elements that emit light having different colors from the driving units 121 to 123, and data signals corresponding to red, green, and blue are respectively transmitted to the data lines D1, D2, and D3. Applied.

  The driving unit 121 of the pixel 120a is connected to the data line D1, and applies a current corresponding to the data voltage from the data line D1 to the red OLED elements OLEDr1 and OLEDr2. The driving unit 122 of the pixel 120b is connected to the data line D2, and applies a current corresponding to the data voltage from the data line D2 to the green OLED elements OLEDg1 and OLEDg2. The driving unit 123 of the pixel 120c is connected to the data line D3 and applies a current corresponding to the data voltage from the data line D3 to the blue OLED elements OLEDb1 and OLEDb2.

  Hereinafter, the pixel according to the present embodiment will be described more specifically with reference to FIG. However, the description about the part which overlaps in connection with 1st Embodiment is abbreviate | omitted. FIG. 12 is a circuit diagram showing a pixel of the OLED display device according to the second embodiment.

  As shown in FIG. 12, the drive unit of the pixel 120a includes a drive transistor M11, switching transistors M12, M13, and M14, capacitors C11 and C12, and light emitting transistors M16a and M16b. The driving unit of the pixel 120b includes a driving transistor M21, switching transistors M22, M23, and M24, capacitors C21 and C22, and light emitting transistors M26a and M26b. The driving unit of the pixel 120c includes a driving transistor M31, switching transistors M32, M33, and M34. , Capacitors C31 and C32, and light emitting transistors M36a and M36b.

According to this embodiment, the drain of the driving transistor M11 in the pixel 120a emitting transistors M16a, is connected to a source of M26b, light-emitting transistor M16a, M26b in response respectively to the emission signal lines E w a, emission signal E w b , Current from the driving transistor M11 is transmitted to the OLED elements OLEDr1 and OLEDr2.

The drain of the driving transistor M21 is connected to the sources of the light emitting transistors M36a and M16b, and the light emitting transistors M36a and M16b send the current from the driving transistor M21 to the OLED according to the light emitting signals of the light emitting signal lines E w a and E w b. It transmits to element OLEDg2, OLEDg1. Similarly, the drain of the driving transistor M31 is coupled to the light-emitting transistor M26a, a source of M36b, light-emitting transistor M26a, M36b in response to the emission signal lines E w a, emission signal E w b, the current from the driving transistor M31 This is transmitted to the OLED elements OLEDb1 and OLEDb2.

  Accordingly, a data voltage corresponding to the same color is applied to one data line during one field, and the driving transistor transmits a current corresponding to the data voltage to the OLED element of the same color. Hereinafter, the driving method of the OLED display device according to the present embodiment will be described in detail with reference to FIG. FIG. 13 is a drive timing chart of the OLED display device according to the present embodiment.

OLED display according to this embodiment, one field (1TV) has two subfields 1SF, is driven by being divided into 2SF, selection of each subfield 1SF, a low level to the selection scan line Sl to S w in 2SF Signals are applied sequentially. Two OLED elements included in one pixel each emit light during a period corresponding to one subfield. The subfields 1SF and 2SF are defined independently for each row. In FIG. 13, the two subfields 1SF and 2SF are shown on the basis of the selected scanning line S1 in the first row.

While the low level selection signal is applied to the previous scanning line S w −1 in the subfield 1SF, the voltages corresponding to the threshold voltages VTH of the driving transistors M11, M21, and M31 are stored in the capacitors C12, C22, and C32. . Thereafter, when the selection signal of the low level to the current scan line S w is applied, each red, green, and the data voltage corresponding to the blue color is applied to the data lines D1, D2, D3, switching transistors M14, M24 , M34, the data voltage is charged to the capacitors C11, C21, C31.

  The light emitting transistors M16a, M36a, and M26a are turned on, and currents corresponding to the voltages stored in the capacitors C11, C21, and C31 are transmitted from the transistors M11, M21, and M31 to the OLED elements OLEDr1, OLEDg2, and OLEDb1, respectively. Is done.

In such a way, by applying a data voltage to the first to the pixels of the w-th row of the subfield 1SF, emit left OLED elements in the two OLED elements included in one pixel.

Then, like the subfield subfield 1SF before the 2SF, the low level selection signal is sequentially applied to the selecting scan lines Sl to S w of w-th row from the first row. Then, the current scan line S w in concatenated pixels 120a, 120b, 120c, while the selection signal to the previous scan line S w -1 is applied, the capacitor C12, C22,32 the driving transistor M11, M21, M31 Save the threshold voltage, the data line D1 during the selection signal to the current scan line S w is applied, D2, red to D3, green, and the data voltage is applied corresponding to the blue capacitor C11, C21 , C31.

Then, in synchronization with the low-level selection signal is sequentially applied to the selecting scan lines Sl to S w, emission signal of a low level is sequentially applied to the emit signal line E1b~E w b. Hereinafter, a current corresponding to the applied data voltage is transmitted to the OLED elements OLEDr2, OLEDg2, and OLEDb2 through the light emitting transistors M26b, M16b, and M36b to emit light.

According to this embodiment, the subfield 1SF, the emission signal line E1a~E w a in 2SF, emitting signals applied to E1b~E w b is maintained at a low level for a period of time, the light-emitting signal is low While being at the level, the OLED element connected to the light emitting transistor to which the light emission signal is applied continuously emits light. In FIG. 13, this period is shown as substantially the same period as the subfields 1SF and 2SF. That is, the OLED element connected to the left side in each pixel emits light with luminance corresponding to the data voltage applied in the period corresponding to the subfield 1SF, and the OLED element connected to the right side corresponds to the subfield 2SF. Light is emitted at a luminance corresponding to the data voltage applied during the period.

  A data voltage corresponding to the same color is applied to each of the data lines D1 to Dm during one field (1TV), and a driving transistor included in one pixel applies a current corresponding to the data voltage to an OLED having the same color. Transmit to the element. Therefore, between the two subfields, the current corresponding to the same color is transmitted to the OLED element through the driving transistor, so that the drain electrode of the driving transistor, that is, the node C corresponds to the current of the same color as the current subfield. Will be charged

That is, when a selection signal is applied to the previous scanning line S w −1 in the pixel 120a and a voltage corresponding to the threshold voltage of the transistor M11 is stored in the capacitor C12, the voltage stored in the capacitor C12 is influenced by the voltage of the node C. However, as described above, the voltage at the node C is affected by the current flowing through the transistor M11 in the previous subfield.

  Since the driving transistor M11 outputs a current corresponding to red in the previous subfield and the current subfield, a voltage for compensating for the deviation of the threshold voltage of the transistor M11 under the same conditions as in the current subfield. Stored in capacitor C12. Therefore, even if a parasitic capacitance component exists in the drain electrode of the driving transistor M11 and the capacitor C12 is charged with a voltage different from the threshold voltage of the driving transistor M11, the capacitor C12 is subjected to the same conditions in the current subfield and the previous subfield. Since the voltage corresponding to the threshold voltage is charged, the deviation of the threshold voltage of the drive transistor M11 can be effectively compensated.

  The driving transistor included in one pixel controls the current flowing through the OLED elements of the same color during one field, so the channel width / length ratio (W / L) of the driving transistor is set. By controlling, the white balance of the display panel can be adjusted. That is, the channel width and length ratios (W / L) of the drive transistors M11, M12, and M13 are set to be different from each other so that different amounts of current are red due to substantially the same level of data voltage. It can be made to flow through green and blue OLED elements.

On the other hand, FIGS. 14A and 14B are diagrams showing memory maps of odd odd and even fields according to the second embodiment, respectively. k = 0, 1, 2, ... when the n-1, the data selection signal D S (3k + 1), D S (3k + 2) and D S (3k + 3) it can be seen that three data are distinguished for each.

Referring to FIG. 14A, in the memory map of the odd field, for example, because in the one line is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored in R (1,1) R (1, 6n-1) to be stored, D S (3k + 2) is turned D S2, emission data is saved from G (1, 2) to G (1,6n), D S ( 3k + 3) is turned D S3 Thus, the emission data is stored from B (1,1) to B (1,6n-1).

Further, since the two lines is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored from R (2, 2) to R (2,6n), D S ( 3k + 2) is turned D S2, emission data is saved from the G (2,1) to G (2,6n-1), D S (3k + 3) is turned D S3, the light-emitting data are stored in the B (2, 2) Up to B (2, 6n) is stored. Thereafter, the odd and even lines are stored in the odd field memory map in the manner described above.

Similarly, referring to FIG. 14B, in the memory map of the even field according to the present embodiment, for example, because in the one line is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored in R (1 , saved from 2) to R (1,6n), D S ( 3k + 2) is turned D S2, emission data is saved from G (1, 1) to G (1,6n-1), D S (3k + 3) is the D S3, so the light emission data may be saved from B (1, 2) to B (1, 6n).

Further, since the two lines is k = 0, D S (3k + 1) is turned D S1, the light-emitting data are stored from the R (2,1) to R (2,6n-1), D S (3k + 2 ) is turned D S2, emission data is saved from G (2, 2) to G (2,6n), D S ( 3k + 3) is turned D S3, the light-emitting data are stored in the B (2,1) Up to B (2,6n-1) is stored. Thereafter, the odd and even lines are stored in the even field memory map in the manner described above.

  Accordingly, as shown in FIGS. 14A and 14B, the light emission data between the sub-pixels of the same color is stored separately in each line for each sub-field.

  On the other hand, in FIG. 12 described above, the pixel driving unit according to the present embodiment is illustrated to include a driving transistor, four switching transistors, two capacitors, and two light-emitting transistors, but the pixel illustrated in FIG. In addition, an OLED display device can be configured using various types of pixels.

  As described above, in other pixels of the OLED display device according to the present embodiment, the driving transistor drives the OLED element that emits light of the same color, and controls the width and length of the channel of the driving transistor, thereby achieving white balance. Can be adjusted.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in FIG. 13, the OLED display device is illustrated as being driven by a sequential scanning method in a single scan, but the present invention is not limited to this, and a double scanning method, an interlaced scanning method, or other It can also be applied to the scanning method.

  In FIG. 12, one pixel is described as having two OLED elements. However, after one pixel is provided with OLED elements that emit red, green, and blue light, one field is divided into three. The pixel circuit can be driven by being divided into subfields.

  The present invention can be applied to a display data memory management method of a light emitting display device, and can be applied to a display data memory management method of an organic light emitting display device using electroluminescence of an organic material.

It is a schematic explanatory drawing which shows the OLED display apparatus by 1st and 2nd embodiment. It is explanatory drawing which shows the pixel of the OLED display device by 1st and 2nd embodiment. It is explanatory drawing which shows the odd field subpixel of the OLED display apparatus by 1st and 2nd embodiment. It is explanatory drawing which shows the even field subpixel of the OLED display apparatus by 1st and 2nd embodiment. It is explanatory drawing which shows the drive of two subpixels by 1st and 2nd embodiment. It is explanatory drawing which shows roughly the light emission drive of the adjacent sub pixel by 1st Embodiment. It is explanatory drawing which shows the outline of the pixel of the OLED display apparatus by 1st Embodiment. It is a circuit diagram which shows the pixel of the OLED display apparatus by 1st Embodiment. It is explanatory drawing which shows the input data map of the OLED display apparatus by 1st Embodiment. It is explanatory drawing which shows the memory map management concept of the odd field by 1st Embodiment. It is explanatory drawing which shows the memory map management concept of the even field by 1st Embodiment. It is explanatory drawing which shows the memory map of the odd field by 1st Embodiment. It is explanatory drawing which shows the memory map of the even field by 1st Embodiment. It is explanatory drawing which shows roughly the light emission drive of the sub pixel of the same color by 2nd Embodiment. It is explanatory drawing which shows the outline of the pixel of the OLED display apparatus by 2nd Embodiment. It is a circuit diagram which shows the pixel of the OLED display apparatus by 2nd Embodiment. It is explanatory drawing which shows the drive timing of the OLED display apparatus by 2nd Embodiment. It is explanatory drawing which shows the memory map of the odd field by 2nd Embodiment. It is explanatory drawing which shows the memory map of the even field by 2nd Embodiment.

DESCRIPTION OF SYMBOLS 100 Display panel 110a Pixel 110b Pixel 110c Pixel 111 Drive part 112 Drive part 113 Drive part 200 Selection scan drive part 300 Light emission scan drive part 400 Data drive part

Claims (6)

Each of the plurality of pixels includes at least two sub-pixels that emit light of different colors, and one field is driven by being divided into a plurality of sub-fields including a first sub-field and a second sub-field. A light emitting display in which at least two data signals corresponding to the same color are time-divided and applied to the data lines, and selection signals are sequentially applied to the plurality of scanning lines in the first subfield and the second subfield. A display data memory management method for a device;
a) dividing input data corresponding to a display image of the light emitting display device into data of the first subfield or data of the second subfield;
b) arranging the data of the first subfield and the second subfield data in the order of light emission driving;
c) storing the data of the first subfield and the second subfield data arranged in the step b) separately for each pixel;
A display data memory management method for a light-emitting display device.   2. The display data memory management method of a light emitting display device according to claim 1, wherein the light emission driving in step b) is time division driving between adjacent sub-pixels.   2. The display data memory management method for a light emitting display device according to claim 1, wherein the light emission driving in step b) is time division driving between the same colors.   The light emission of claim 1, wherein in the step c), the arranged data of the first subfield and the second subfield data are stored in the order read from the memory map. A display data memory management method for a display device.   5. The memory map according to claim 4, wherein when 6n pieces of input data are provided in a column direction, the memory map has 3n pieces of input data in the column direction of each of the first and second subfields. A display data memory management method for the light emitting display device according to claim 1. The memory map, k = 0, 1, 2 for each display line, ..., the case of n-1, corresponding to D S (3k + 1), the data selection signal D S (3k + 2) or D S (3k + 3) 5. The display data memory management method according to claim 4, wherein:

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